Check the listing for details. Viking electronics CTG-1A Clock Controlled Tone Generator. Condition: New. Listed at 317.99 USD. Accurate 24 hour digital time clock displays hours and minutes synced to AC power User programmable 24 hour, 128 event timer in two separate schedules Programmable day of week on/off feature Programmable single, double or triple alert tone output (selectable bong or buzzer) Three contact closure controlled sounds: 1) Emergency siren (yelp) sound 2) Temporal (slow whoop) evacuation signal *NFPA/ANSI compliant when used with supporting equipment 3) Doorbell (chime) sound Volume controllable, 600 ohm line level audio output Non-volatile memory with four day clock backup Two sets of DPDT relay contacts for muting paging or background music during alert tones or timed relay events Switchable 50/60 Hz operation Switch for Daylight Saving Time Time Relay Mode